Comparison of Austenitic High-Mn-Steels with Different Mn- and C-Contents Regarding their Processing Properties

Hofer, Sabrina; Hartl, Mario; Schestak, Günther; Schneider, Reinhold; Arenholz, E.; Samek, Ludovic

doi:10.1007/s00501-011-0634-7

Cited by 12 publications

(5 citation statements)

References 10 publications

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“…As observed in Figure 4, at a constant strain rate the corresponding peak strain (ε P ), where the peak stress was reached, gradually decreased with increasing temperature. The comparison of the obtained flow curves with TWinning Induced Plasticity (TWIP) steels with significantly higher Mn-contents clearly indicate that TWIP steels exhibit higher stresses [10,11], whereas lower alloyed conventional TRIP steels tend to have lower stresses than the Medium-Mn steels [12,13]. Strain rate sensitivity.…”

Section: Resultsmentioning

confidence: 98%

Hot Deformation Behavior of a 3<sup>rd</sup> Generation Advanced High Strength Steel with a Medium-Mn Content

Steineder

Dikovits²,

Béal³

et al. 2015

KEM

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Medium-Mn steels are one of the promising candidates to achieve the desired mechanical properties in the 3rd generation of cold rolled advanced high strength steels (AHSS) for automotive applications. Their duplex microstructure consists of a ferritic matrix with a substantial amount of metastable retained austenite, which transforms to strain-induced martensite upon forming. This strengthening mechanism, well known as the TRansformation Induced Plasticity (TRIP) effect, provides the steel an excellent combination of high strength and elongation with a product of RmxA80 up to 30.000 MPa%. As hot rolling is one of the crucial steps during their production, the hot deformation behavior of Medium-Mn steels has to be thoroughly evaluated during their development stage.Therefore, the present contribution studied the hot deformation response of a 0.1 %C 5.5 %Mn steel by means of hot compression tests using a Gleeble® 3800 device. The influence of different deformation temperatures (900-1100 °C) and strain rates (0.1-10 s-1) on the stress-strain behavior was investigated. The flow curves were analyzed and corrected by the effects of adiabatic heating.Furthermore, the strain rate sensitivity m of the material was determined by evaluating stress values at different strain rates for given temperatures and strains. The m-values can be used to predict the deformation behavior of the material within the investigated range of parameters.Lastly, the hot working behavior of an alternative steel concept for a 3rd Generation AHSS with significantly lower Mn-content was comparatively investigated.

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Section: Resultsmentioning

confidence: 98%

Hot Deformation Behavior of a 3<sup>rd</sup> Generation Advanced High Strength Steel with a Medium-Mn Content

Steineder

Dikovits²,

Béal³

et al. 2015

KEM

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“…Aplicando-se essa relação, o valor da EFE para a liga estudada é da ordem de 12,5mJ/m 2 , valor que justifica a presença de martensitas α' e ε, além da austenita, na condição de laminado a quente. Segundo a literatura [2,3,12,13], se o valor da EFE da liga estiver abaixo de 15mJ/m 2 , frações dessas fases podem ser formadas na matriz austenítica durante o resfriamento após a deformação a quente.…”

Section: Ensaios Mecânicos E Análise Microestruturalunclassified

EFEITO DA TEMPERATURA DE RECOZIMENTO NAS PROPRIEDADES MECÂNICAS E NA MICROESTRUTURA DE UM AÇO COM ALTO TEOR DE Mn LAMINADO A FRIO

Zorzi¹,

Melo²,

Santos³

2014

ABM Proceedings

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Resumo Aços com teor de Mn entre 15% e 30% apresentam ductilidade excepcionalmente alta para sua elevada resistência mecânica, devido à ocorrência de transformação de fases (efeito TRIP) e/ou à formação de maclas de deformação (efeito TWIP) na microestrutura predominantemente austenítica. A adição de Mn ajuda a manter a austenita até a temperatura ambiente, evitando a sua decomposição após o recozimento aplicado depois da laminação a frio. O objetivo desse estudo foi avaliar o efeito da temperatura de recozimento na microestrutura e nos valores de propriedades mecânicas de um aço com 17% de Mn, por meio de simulações piloto das etapas de processamento industrial utilizando dilatômetro e simulador termomecânico do Centro de Pesquisa da Usiminas. Observou-se que o aumento na temperatura de encharque durante o ciclo térmico de recozimento contínuo promoveu a reversão completa da martensita α' para austenita. Além disso, a alteração desse parâmetro praticamente não afetou o limite de resistência e o alongamento total do aço, embora tenha reduzido significativamente o limite de escoamento.

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“…After the development of Hadfield steels, other alloys based on the steel concept of this austenitic manganese steel with varying compositions followed [7]. One such alloy is the Fe-Mn-Al-C alloy or "Fermanal" steel, which was developed to replace some conventional stainless steels (Ni-Cr steels) [8].…”

Section: Introductionmentioning

confidence: 99%

Comparative study of the mechanical and tribological properties of a Hadfield and a Fermanal steel

et al. 2017

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In this study, Fe-12.50Mn-1.10C-1.70Cr-0.40Mo-0.40Si-0.50(max)P-0.50(max)S (Hadfield alloy) and Fe-28.4Mn-0.86C-1.63Al-0.42Cu-1.80Mo-1.59Si-0.60W (Fermanal alloy) (Wt. %) in the aged condition were compared in terms of its tribological and microstructural properties. The x-ray diffraction (XRD) patterns were refined with the lines of the austenitic γ -phase, Chromium Iron Carbide (Cr 2 Fe 14 C), Iron Carbide (Fe 2 C), and Iron Oxide (Fe 0.974 O (II)) for the Hadfield alloy, and the lines of the austenitic γphase, martensite (M), Mn 1.1 Al 0.9 phase and iron carbide (Fe 7 C 3 ) for the Fermanal alloy. Mössbauer spectra were fit with two sites for the Hadfield alloy, which displayed as a broad singlet because of the austenitic disordered phase, and had a magnetic hyperfine field distribution, which corresponds to the Cr 2 Fe 14 C ferromagnetic carbides found by XRD. There were two paramagnetic sites, a singlet, which corresponds to the austenite disordered phase, and a doublet, which can be attributed to the Fe 7 C 3 carbide. The obtained Rockwell C hardness for aged Hadfield and Fermanal alloys were 43.786 and 50.018 HRc, respectively.

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Comparison of Austenitic High-Mn-Steels with Different Mn- and C-Contents Regarding their Processing Properties

Cited by 12 publications

References 10 publications

Hot Deformation Behavior of a 3<sup>rd</sup> Generation Advanced High Strength Steel with a Medium-Mn Content

Hot Deformation Behavior of a 3<sup>rd</sup> Generation Advanced High Strength Steel with a Medium-Mn Content

EFEITO DA TEMPERATURA DE RECOZIMENTO NAS PROPRIEDADES MECÂNICAS E NA MICROESTRUTURA DE UM AÇO COM ALTO TEOR DE Mn LAMINADO A FRIO

Comparative study of the mechanical and tribological properties of a Hadfield and a Fermanal steel

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